Measuring instrument.



W. H. BRISTOL.

MEASURING INSTRUMENT.

APPLICATION FILED sums. 1914.

v Patented Apr. 20, 1915.

3 mm? Moan UNIT ED srA'rEsrATanmorFrCn I WILLIAM n sms ron, or WATERBURY, CONNECTICUT, nssmnon To run mus'roi.

COMPANY; or WATERBURY, CONNECTICUT; A CORPORATION or CONNECTICUT.

MEASURING INSTRUMENT.

Specification of Letters Patent. Patented Apr; 20-, 1915.

Application med September a, 1914.. Serial No. 880,772. a

ticularly to the recording arm or pointer ,which is employed to retain the marking means adapted to move over the face of the chart of the instrument.

It hasfor its object to provide a recording 'arm or pointer which shall be resilient throughout its length in a direction at right angles to its movement, in order to admit, without disturbing the adjustment of the said arm, of the ready insertion or removal of the chart upon which the record is to be made. v

The invention has for a further object to enable the said arm to be conveniently adjusted, not only in its initial setting but also for a variation in the zero position after the =instrument has been placed in service.

' The nature of the invention will be best understood when described in connection with the accompanying drawings, in which- Figure 1 is a rear elevation of theimproved recording arm. Fig. 2 is a front elevation thereof and of a portion of the chart. Fig. 3 is a side elevation of the recording arm and portion of the chart. Fig. 4 is a detail transverse cross-section through adjusting means employed in connection of a portion of the arm and in with the arm. Fig. 5 is an enlarged detail icates, in

dotted lines, the' possible variations of the position of the arm.

Similar Characters of reference iiesignate.

corresponding parts throughout the several views.

Referring to the drawings, 10 designates a resilient support in the nature of a thin strip of suitable metal and extends approximately half way along a resilient arm or pointer proper 11 similarly constituted. The upper end of support 10 is provided with a suitable slot 12; and at its lower end it is attached to a member 13 by whith the recording member as a whole is secured'inwell-known manner to tlreactuatingmechanism (not shown) for said recording member. A pin14 of a rivet 15 passes through the support 10 and through the arm 11 and attaching member 18; and, ii initially setting the instrument,-

support 10 may swing about the said pin M as an axis until the proper angular position is obtained. It is then fixedly secured in this positlon, with respect to'the piece 13, as

by soldering it thereto and to the pin 14 or by attaching it inany other convenient manner thereto. Moreover, the lower end of arm 11 is provided with a slot 16 through which the pin 14 passes,'a washer 17 bein interposed between the arm 11 and the hen of the rivet 15. This permits of a radial adjustment of the recording arm; and,when the" proper position is obtained, arm 11 is fixedly-secured to the washer 17, as by solderlng it' thereto, "to positively insure the radial position of the marking point 24 carried by the outer end of the arm 11. Arm 11 thus remains free to move relatively to support 10 about pin 14 as an axis, and its movement is controlled as follows Movably secured to the upper end of sup port 10 is a slide or U-shape piece 18 which is held in the said slot 12 by means of a rivet 19, the base of the slide piece being mounted between upperwface of support 10-and the under face of the arm 11. The sides of said U-shape piece 18 embrace the arm 11 and are removed the necessary distance from the edges thereof to afford the desired de ee'of adjustment of said arm. To efi'ect t is ad-' justment, there is fixed to the upper surface ofarnf 11 a threaded block or thelike 20 throughwhich passes a screw 21 guided in the sijde walls of the slide 18 and provided at one end with'a suitable head 22 by which the screw ma be rotated. In thus rotating the screw 21 y rotating its head 22, arm 11 is caused to move angularly relatively to its support 10 and about. the pin 14 as an axis,

as indicated in the dotted lines shownin Fig. 5., A suitable adjustment is thereby prov'ded for the said arm 11, after the in- .stru ent has been initially set, and which adjustment will be preserved during the insertion and removal of the chart 23 0V r which the marking point 24 operates. 11 flexing" the pointer to enable a chart to be removed or inserted, rivet 19 is free to slide in its slot 12 and no undue strain is placed upon the recording member.

I claim 1. A recording member, comprising: at-

attaching means; a resilient marking arm sliding member securedto said supporting member secured thereto atfd prbvided iivith a slot-at'its free end; a resilient marking taching means; a resilient supporting mem arm pivotally attached to saidsupporting ber'initially adjustable with respect to. said member and adjustable means linoluding a'.

carried by said support and initially adjust 'nriember between-the same and said marking V able with respect thereto; and means to arm andha'ving sides embracing the latter .50

elfe'ct a further adjustment. between said but removed a suitable distance therefrom,

marking arm and said support.

said sliding member beingfmovable in" the 2. A. recording membeg comprising;ate"; slot 6f the, supporting member, a threaded taching means g iresilient supporting mem ber initially angularly adjustable With re-- speet tosai'd attaching member; a resilient marking arm carried by said support and initially radially adjustable ,With respect thereto; and means to effect an angular adjustment between said marking armand its said support.

.3. A recording member, comprisingil an attaching member; a resilient supporting member secured thereto andprovidedo with a slot atv its free end ,a' resilient marking arm provided With a slot at its inner end and pivotally attached at "said end to 'said sup porting member; "and adjustable means Working in the slot of said supportingmemaber and connected with said marking arm to effect an adjustment between the same attaching member a resilient supporting and said supporting member. A J 4. A recording member, "comprising; an

r member secured thereto and provided with aslot at its free end; a resilient marking arm pivotally attached to said supporting member; and adjustable means including a sliding member secured to said supporting I member and movable in the slot thereof, a

threaded block fixed to said marking arm, and a rotatab'lesorew working in said block and guided iu-said sliding member.

" 5. Agrecording member, comprising: an attaching member; a resilient supporting block fixed to the UPI er surface of the marking: arm, and a rotatable screw working in" block and guided in the side'sof said bllding member.

6. A recording fmemberyicomprising: at"

f ,attaching member; a resilient, supporting l member secured thereto and [provided .Wltll a slot atits free end;"a resilient in'arking' arm provided with a slot at its inner end, a

rivet passing "th erethrou'gh and by means of which said arm is pivota llysecured to said support, and a washer, 'between xthehead of said rivet-and the upper surface of said marking arm and to which" the latter may be secured; and adji stable means ii1- eluding a sliding member secured to said supporting member between the same and said recording arm and havingsides embram' ing thelatter but remoireda fsuitablie dis ewe. (reek; this 

